bug#26996: 25.1; doc-view-revert-buffer doesn't detect file change while using tramp

[Iakov Davydov <dav02.davs@myths.ru>]

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Hi,
I have problem with reverting buffer when opening pdf via tramp.
This happens in emacs 24 and emacs 25, with different version of tramp.

Steps to reproduce are like this:
1. Open pdf with tramp over ssh -> DocView mode.
2. Update the pdf somehow on the server.
3. Press 'g' to revert buffer (doc-view-revert-buffer) -> "yes".

If the pdf was updated, I expect to see an updated pdf. Instead I see an
old pdf.

On tramp-mailing list I was told that this is a bug in
doc-view-revert-buffer and therefore I have to report is as emacs bug.

Here's a response from Michael Albinus:
<===>
I've checked doc-view-revert-buffer. It works over
doc-view--buffer-file-name. So it doesn't detect a changed pdf, see its
docstring:

--8<---------------cut here---------------start------------->8---
doc-view--buffer-file-name is a variable defined in ‘doc-view.el’.
Its value is "/tmp/docview1000/123.pdf"
Local in buffer 123.pdf</ssh:host:>; global value is nil

Documentation:
Only used internally.
The file name used for conversion. Normally it’s the same as
‘buffer-file-name’, but for remote files, compressed files and
files inside an archive it is a temporary copy of
the (uncompressed, extracted) file residing in
‘doc-view-cache-directory’.
--8<---------------cut here---------------end--------------->8---

Nothing Tramp could do. I recommend to write an Emacs bug.
<===>

Is there a way to correct this behavior?

Thank you,
Iakov





In GNU Emacs 25.1.2 (x86_64-pc-linux-gnu, GTK+ Version 3.18.9)
of 2016-09-29 built on lcy01-19
Windowing system distributor 'The X.Org Foundation', version 11.0.11804000
System Description: Ubuntu 16.04.2 LTS

Configured using:
'configure --build=x86_64-linux-gnu --prefix=/usr
'--includedir=${prefix}/include' '--mandir=${prefix}/share/man'
'--infodir=${prefix}/share/info' --sysconfdir=/etc --localstatedir=/var
--disable-silent-rules '--libdir=${prefix}/lib/x86_64-linux-gnu'
'--libexecdir=${prefix}/lib/x86_64-linux-gnu' --disable-maintainer-mode
--disable-dependency-tracking --prefix=/usr --sharedstatedir=/var/lib
--program-suffix=25 --with-modules --with-x=yes --with-x-toolkit=gtk3
'CFLAGS=-g -O2 -fstack-protector-strong -Wformat
-Werror=format-security' 'CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=2'
'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro''

Configured features:
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NOTIFY LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 MODULES

Important settings:
value of $LC_MONETARY: en_US.UTF-8
value of $LC_NUMERIC: en_US.UTF-8
value of $LC_TIME: en_US.UTF-8
value of $LANG: en_US.UTF-8
locale-coding-system: utf-8-unix

Major mode: DocView

Minor modes in effect:
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async-bytecomp-package-mode: t
show-paren-mode: t
tooltip-mode: t
global-eldoc-mode: t
electric-indent-mode: t
mouse-wheel-mode: t
menu-bar-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
blink-cursor-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
buffer-read-only: t
line-number-mode: t
transient-mark-mode: t


Load-path shadows:
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/usr/share/emacs/site-lisp/dictionaries-common/ispell hides
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/usr/share/emacs/site-lisp/latex-cjk-thai/thai-word hides
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Memory information:
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-- 
Iakov Davydov
Postdoc, Department of Ecology and Evolution, University of Lausanne
Swiss Institute of Bioinformatics

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